Mercury-free salt detection method of total iron content of iron ore
A detection method, iron ore technology, applied in the field of analytical chemistry, can solve the problems of low analysis accuracy, high cost, cumbersome operation, etc., and achieve the effect of high analysis accuracy, low usage, and shortened operation process
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Embodiment 1
[0055] Embodiment 1 uses the inventive method to measure total iron content in the iron standard liquid
[0056] Preparation of iron standard solution: Take 300mL of water, add 50mL of analytically pure sulfuric acid, 42.5g of analytically pure ammonium ferrous sulfate, dissolve, transfer to a 2000mL volumetric flask, dilute to the mark with water, shake well, and prepare iron standard solution.
[0057]The steps for determining the total iron content of the iron standard solution are as follows:
[0058] a. Sample processing
[0059] Take 25mL of iron standard solution in a 500mL conical flask, add 30mL of 1+1 hydrochloric acid, first use potassium permanganate to oxidize most of the iron standard solution into ferric iron, heat to 100°C and keep this temperature, then use 50g / L The stannous chloride solution is reduced to yellow and disappears;
[0060] b. Redox
[0061] Add potassium permanganate solution dropwise to the solution obtained in step a until the solution jus...
Embodiment 2
[0083] Embodiment 2 uses the inventive method to measure total iron content in iron ore
[0084] The specific operation steps are as follows:
[0085] a. Sample processing
[0086] Take 0.1500g of iron ore sample, add 30ml hydrochloric acid solution, then add 0.5g sodium fluoride, heat to 90°C and keep this temperature, when the solution just turns yellow, add stannous chloride solution dropwise until the yellow color disappears, until The sample is completely dissolved;
[0087] b. Redox
[0088] Add potassium permanganate solution dropwise to the solution obtained in step a until the solution just appears light yellow, then add 1 g of solid diluent, heat to 90°C, and take it off; the solid diluent is sodium chloride and zinc powder in weight ratio 100:1 mixture;
[0089] c. Titration
[0090] Add 20 mL of sulfur-phosphorus mixed acid and 3 drops of sodium diphenylamine sulfonate indicator to the solution obtained in step b, and titrate with potassium dichromate standard...
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